778888 has 32 divisors (see below), whose sum is σ = 1632960. Its totient is φ = 345280.

The previous prime is 778879. The next prime is 778903. The reversal of 778888 is 888877.

It is an Ulam number.

It is a plaindrome in base 10.

It is a zygodrome in base 10.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4581 + ... + 4747.

It is an arithmetic number, because the mean of its divisors is an integer number (51030).

2⁷⁷⁸⁸⁸⁸ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 778888, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (816480).

778888 is an abundant number, since it is smaller than the sum of its proper divisors (854072).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

778888 is a wasteful number, since it uses less digits than its factorization.

778888 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 237 (or 233 counting only the distinct ones).

The product of its digits is 200704, while the sum is 46.

The square root of 778888 is about 882.5463160651. The cubic root of 778888 is about 92.0078758223.

The spelling of 778888 in words is "seven hundred seventy-eight thousand, eight hundred eighty-eight".